Abstract: An irrigation sprinkler apparatus has a rapid change nozzle which allows the changing of a nozzle without the use of tools or any disassemble of the sprinkler head. The rapid change nozzle slides into a window in the side of the sprinkler head and latches into place.

Abstract: A fluid pressure regulator for adjusting the pressure of fluid passing through a pipe is provided for use with irrigation sprinklers or the like. The pressure regulator has a housing having a passageway therethrough, which has a throttling stem slidably mounted in the housing passageway and having a passageway therethrough. A compression spring is mounted between the throttling stem and the housing to bias the throttling stem relative to the housing. A throttling stem seat is attached in the passageway through the housing and has a passageway therethrough and has the end of a throttling member extending thereinto for adjusting the passageway through the throttling member seat so that fluid pressure is adjusted between the input and output of the fluid pressure regulator.